@article{IIGUM_2016_18_a5,
     author = {M. A. Novikov},
     title = {Signdefiniteness and reduction to full squares for the bundle of tree quadratic forms},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {74--92},
     publisher = {mathdoc},
     volume = {18},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2016_18_a5/}
}